is celebrating its tenth anniversary this year, and the stars are aligning for next week's season 20 finale!In addition to the season 20 coaches — Blake Shelton, Kelly Clarkson, John Legend and Nick Jonas — taking the stage alongside their final artists, the star-studded, two-night finale event will feature performances from a host of musical superstars, including a few familiar faces!Adam Levine will make his return to stage, as Maroon 5 performs their latest single, «Beautiful Mistakes,»